The cheapest way to run air conditioning in Brisbane is to set the thermostat to 24–25°C, run ceiling fans alongside the unit, cool during off-peak or daytime solar hours, and keep filters clean. Together these steps can cut air conditioning running costs by 30 percent or more. A medium 5kW split system costs roughly $0.35 to $0.55 per hour to run at Brisbane electricity rates — how you use it makes the biggest difference to your bill.
Running Costs for Split Systems, Ducted AC and Portable Units in Brisbane
Air conditioning running costs depend on the type of system, its size, how efficiently it operates and how many hours you use it. In Brisbane's subtropical climate, AC can account for 30 to 50 percent of your electricity bill during summer. For homeowners across North Lakes, Redcliffe, Mango Hill, Chermside and Aspley, here is what it actually costs to run different types of air conditioning.
Air Conditioning Running Costs Comparison
| System Type | Hourly Cost | Daily (8 hrs) | Monthly (8 hrs/day) |
|---|---|---|---|
| Small split (2.5kW) | $0.18 – $0.30 | $1.44 – $2.40 | $43 – $72 |
| Medium split (5kW) | $0.35 – $0.55 | $2.80 – $4.40 | $84 – $132 |
| Large split (7kW) | $0.50 – $0.75 | $4.00 – $6.00 | $120 – $180 |
| Large split (9kW+) | $0.65 – $1.00 | $5.20 – $8.00 | $156 – $240 |
| Ducted (small home) | $0.80 – $1.50 | $6.40 – $12.00 | $192 – $360 |
| Ducted (large home) | $1.50 – $3.00 | $12.00 – $24.00 | $360 – $720 |
| Portable unit | $0.40 – $0.70 | $3.20 – $5.60 | $96 – $168 |
| Ceiling fan | $0.02 – $0.03 | $0.16 – $0.24 | $5 – $7 |
Costs based on Brisbane electricity rate of approximately 30c/kWh. Inverter systems run at lower wattage once the room reaches the set temperature.
What Affects Air Conditioning Running Costs?
1. Thermostat Setting
Every degree below 24°C in summer adds roughly 10 percent to running costs. Setting your air conditioner to 24-25°C is the sweet spot.
2. Inverter vs Non-Inverter
Inverter systems adjust compressor speed to match the cooling load, using 30 to 50 percent less electricity than older non-inverter (fixed-speed) systems that constantly cycle on and off.
3. System Size vs Room Size
An undersized AC runs constantly. An oversized AC short-cycles. Both waste energy. Correct sizing is critical for efficiency.
4. Insulation and Sealing
Poorly insulated homes and air leaks around doors, windows and ceiling penetrations force the AC to work much harder. Improving insulation and sealing gaps can reduce cooling costs by 10 to 20 percent.
5. Maintenance
Dirty filters, blocked outdoor units and low refrigerant all reduce efficiency and increase running costs. Clean filters every 4 to 6 weeks and service annually.
The Cheapest Way to Run Air Conditioning in Brisbane
Cutting your air conditioning running costs comes down to three things: the temperature you set, running fans alongside the unit, and when you draw the power.
Best Temperature Settings
Set your air conditioner to 24–25°C in summer. This is the most cost-effective range for Brisbane’s climate. Every degree cooler than 24°C adds roughly 5 to 10 percent to your running costs, so dropping the thermostat to 20°C can cost far more without feeling much cooler. In winter, aim for 18–20°C on reverse-cycle heating.
Use Ceiling Fans With Your Air Conditioner
A ceiling fan costs only 2 to 3 cents per hour to run and creates a wind-chill effect that makes a room feel about 2°C cooler. Running a fan lets you raise the air conditioner thermostat by 2 to 3 degrees for the same comfort, saving 20 to 30 percent on cooling costs. For a deeper comparison of the two, see our guide on ceiling fans vs air conditioning and which is cheaper to run.
Leverage Solar and Off-Peak Tariffs
If you have rooftop solar, run your air conditioning during the middle of the day when your panels are generating — you are effectively cooling for free. If you are on a time-of-use tariff, shift heavy cooling to off-peak hours and pre-cool the home before peak pricing kicks in (typically 4–9pm). Check your electricity plan for your exact off-peak windows.
Other Ways to Cut Running Costs
- Use zone control on ducted systems — only cool the rooms you are using
- Clean filters every 4 to 6 weeks so the system does not work harder than it needs to
- Upgrade old non-inverter systems to modern inverter models (30–50 percent more efficient)
- Use timers so you are not cooling empty rooms
- Seal draughts and improve insulation to keep cool air in
- Install surge protection to protect the compressor
Air Conditioning Installation Costs
| System | Supply + Install (AUD) |
|---|---|
| Small split (2.5-3.5kW) | $1,800 – $3,000 |
| Medium split (5-7kW) | $2,500 – $4,500 |
| Large split (7kW+) | $3,500 – $5,500 |
| Multi-head split | $4,500 – $9,000+ |
| Ducted system | $8,000 – $18,000+ |
| Electrical circuit for AC | $250 – $500 |
| Switchboard upgrade (if needed) | $800 – $3,500 |
All air conditioning installations require a dedicated electrical circuit and isolator switch. If your switchboard is full, an upgrade may be required. Connex Electrical handles the full electrical side of AC installation.
Areas We Service Across Brisbane and North Brisbane
Connex Electrical provides expert electrical services across Brisbane and North Brisbane, including:
- North Lakes
- Redcliffe
- Mango Hill
- Griffin
- Kallangur
- Burpengary
- Morayfield
- Caboolture
- Chermside
- Aspley
- Everton Park
- Stafford
- Wavell Heights
- Murrumba Downs
- Rothwell
- Deception Bay
- Petrie
- Lawnton
- Strathpine
- Brendale
- Albany Creek
- Eatons Hill
- Warner
Our Full Range of Electrical Services
- Switchboard Upgrades
- Emergency Electrician
- Air Conditioning Installation
- Electrical Safety Inspections
- Surge Protection
- EV Charger Installation
- LED Lighting Installation
- Ceiling Fan Installation
- Smoke Alarm Installation
- Powerpoint Installation
- Residential Electrician
- Commercial Electrician
- Data Cabling
Need AC Electrical Work?
Connex Electrical installs dedicated AC circuits, switchboard upgrades and surge protection for air conditioning systems across North Brisbane.
Call 0474 207 609 or visit our contact page to book.
Frequently Asked Questions
A medium 5kW split system costs approximately $0.35 to $0.55 per hour at Brisbane electricity rates. Smaller units cost less, and running costs drop further with an efficient inverter system set to 24-25°C.
Ducted systems cost around $0.80 to $3.00 per hour depending on home size. Zone control significantly reduces costs by only cooling the rooms you are using.
Yes. Ceiling fans cost only 2 to 3 cents per hour to run and let you raise the air conditioner thermostat by 2 to 3 degrees, saving 20 to 30 percent on cooling costs.
Portable air conditioners cost roughly $0.40 to $0.70 per hour to run. They are less efficient than split systems and are best used as a temporary solution.
Set the thermostat to 24-25°C, use an efficient inverter system correctly sized to the room, run ceiling fans alongside it, seal draughts, and service the unit annually. Together these can cut running costs by 30 percent or more.
Yes. All air conditioning installations require a dedicated electrical circuit and isolator switch, and sometimes a switchboard upgrade. This work must be done by a licensed electrician such as Connex Electrical (QLD licence #92217).
Need this done in your suburb? Connex Electrical services all North Brisbane and Moreton Bay suburbs including Carseldine · Lawnton · Woody Point.
Learn more about our Air Conditioning Installation services → | All suburbs we service
Call 0474 207 609 for a free quote.
Our Electrical Services
Air Conditioning Installation · Ceiling Fan Installation · Switchboard Upgrades · Smoke Alarm Installation · Powerpoint Installation · LED Lighting Installation · Electrical Maintenance · Electrical Safety Inspections · EV Charger Installation · Emergency Electrician · Commercial Electrician · Data Cabling · Surge Protection
Areas We Service
Electrician North Lakes · Electrician Redcliffe · Electrician Chermside · Electrician Caboolture · Electrician Morayfield · Electrician Burpengary · Electrician Narangba · Electrician Kallangur · Electrician Mango Hill · Electrician Griffin · Electrician Dakabin · Electrician Petrie · Electrician Lawnton · Electrician Deception Bay · Electrician Rothwell · Electrician Kippa-Ring · Electrician Margate · Electrician Clontarf · Electrician Scarborough · Electrician Woody Point · Electrician Bridgeman Downs · Electrician Murrumba Downs · Electrician Aspley
Industry Resources
- QBCC — Queensland Building and Construction Commission
- Energex — SE Queensland Electricity
- Electrical Safety Office Queensland
Need an electrician? Call Connex Electrical on 0474 207 609 for a free quote.